This is Snowflake #98 in the book of 100 Snowflakes. Instructions on Page 107. Pictured on page 40 in Showcase.

“Blue ice consists of large, single ice crystals, ans is usually found in glaciers.“

Finished diameter: 3-3/4 in. (95 mm)
Thread required: 18 yd (16.5 m)

All pattern samples in this book are made with size 10 thread and a size 5 (1.9 mm) crochet hook.